chore: 清理未使用的依赖

移除以下未使用的 npm 依赖：
 - fullcalendar（仅 CSS 引用，已删除相关 SCSS）
 - @splidejs/react-splide
 - @tanstack/react-virtual
 - @tippyjs/react
 - react-custom-scrollbars-2
 - react-force-graph-3d
 - react-just-parallax
 - react-responsive
 - react-scroll-into-view
 - recharts
 - styled-components

 同时清理：
 - craco.config.js 中的 @fullcalendar 分包配置
 - SCSS 中的 fullcalendar 样式文件和 import

package.json

@@ -15,9 +15,6 @@
     "@fontsource/raleway": "^4.5.0",
     "@fontsource/roboto": "^4.5.0",
     "@reduxjs/toolkit": "^2.9.2",
-    "@splidejs/react-splide": "^0.7.12",
-    "@tanstack/react-virtual": "^3.13.12",
-    "@tippyjs/react": "^4.2.6",
     "antd": "^5.27.4",
     "axios": "^1.10.0",
     "classnames": "^2.5.1",
@@ -27,34 +24,26 @@
     "echarts-for-react": "^3.0.2",
     "echarts-wordcloud": "^2.1.0",
     "framer-motion": "^12.23.24",
-    "fullcalendar": "^5.9.0",
     "history": "^5.3.0",
     "klinecharts": "^10.0.0-beta1",
     "lucide-react": "^0.540.0",
     "posthog-js": "^1.295.0",
     "react": "^19.0.0",
-    "react-custom-scrollbars-2": "^4.4.0",
     "react-dom": "^19.0.0",
-    "react-force-graph-3d": "^1.29.0",
     "react-github-btn": "^1.2.1",
     "react-icons": "^4.12.0",
     "react-input-pin-code": "^1.1.5",
     "react-is": "^19.0.0",
-    "react-just-parallax": "^3.1.16",
     "react-markdown": "^10.1.0",
     "react-redux": "^9.2.0",
-    "react-responsive": "^10.0.1",
     "react-router-dom": "^6.30.1",
     "react-scripts": "^5.0.1",
     "react-scroll": "^1.8.4",
-    "react-scroll-into-view": "^2.1.3",
     "react-table": "^7.7.0",
     "react-to-print": "^3.0.3",
-    "recharts": "^3.1.2",
     "remark-gfm": "^4.0.1",
     "sass": "^1.49.9",
     "socket.io-client": "^4.7.4",
-    "styled-components": "^5.3.11",
     "stylis": "^4.0.10",
     "stylis-plugin-rtl": "^2.1.1",
     "typescript": "^5.9.3"